Added a million IE11 polyfills...

src/utils/index.js

@@ -1,7 +1,7 @@
 import I18n from '../i18n';
 
 /**
- * 'Deflates' the HTML contained in the given parent node. 
+ * 'Deflates' the HTML contained in the given parent node.
  * Deflation will completely drop empty text nodes, and replace
  * multiple spaces, tabs, newlines with a single space. This way,
  * character offsets in the markup will more closely represent
@@ -22,7 +22,7 @@ const deflateNodeList = parents => {
           // Text node - trim
           const trimmed = node.textContent.replace(/\s\s+/g, ' ');
           return [...compacted, document.createTextNode(trimmed)];
-        } else { 
+        } else {
           // Empty text node - discard
           return compacted;
         }
@@ -33,7 +33,7 @@ const deflateNodeList = parents => {
   }
 
   // Replace original children with deflated
-  parents.forEach(parent => { 
+  parents.forEach(parent => {
     const deflatedChildren = deflateOne(parent);
     parent.innerHTML = '';
     deflatedChildren.forEach(node => parent.appendChild(node));
@@ -72,6 +72,27 @@ export const addPolyfills = () => {
     };
   }
 
+  if (!String.prototype.startsWith) {
+      Object.defineProperty(String.prototype, 'startsWith', {
+          value: function(search, rawPos) {
+              var pos = rawPos > 0 ? rawPos|0 : 0;
+              return this.substring(pos, pos + search.length) === search;
+          }
+      });
+  }
+
+  if (!String.prototype.includes) {
+    String.prototype.includes = function(search, start) {
+      'use strict';
+
+      if (search instanceof RegExp) {
+        throw TypeError('first argument must not be a RegExp');
+      }
+      if (start === undefined) { start = 0; }
+      return this.indexOf(search, start) !== -1;
+    };
+  }
+
   if (!Array.prototype.find) {
     Object.defineProperty(Array.prototype, 'find', {
       value: function(predicate) {
@@ -79,23 +100,23 @@ export const addPolyfills = () => {
         if (this == null) {
           throw TypeError('"this" is null or not defined');
         }
-  
+
         var o = Object(this);
-  
+
         // 2. Let len be ? ToLength(? Get(O, "length")).
         var len = o.length >>> 0;
-  
+
         // 3. If IsCallable(predicate) is false, throw a TypeError exception.
         if (typeof predicate !== 'function') {
           throw TypeError('predicate must be a function');
         }
-  
+
         // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
         var thisArg = arguments[1];
-  
+
         // 5. Let k be 0.
         var k = 0;
-  
+
         // 6. Repeat, while k < len
         while (k < len) {
           // a. Let Pk be ! ToString(k).
@@ -109,14 +130,44 @@ export const addPolyfills = () => {
           // e. Increase k by 1.
           k++;
         }
-  
+
         // 7. Return undefined.
         return undefined;
       },
       configurable: true,
       writable: true
     });
-    
+
+  }
+
+  if (typeof Object.assign !== 'function') {
+    // Must be writable: true, enumerable: false, configurable: true
+    Object.defineProperty(Object, "assign", {
+      value: function assign(target, varArgs) { // .length of function is 2
+        'use strict';
+        if (target === null || target === undefined) {
+          throw new TypeError('Cannot convert undefined or null to object');
+        }
+
+        var to = Object(target);
+
+        for (var index = 1; index < arguments.length; index++) {
+          var nextSource = arguments[index];
+
+          if (nextSource !== null && nextSource !== undefined) {
+            for (var nextKey in nextSource) {
+              // Avoid bugs when hasOwnProperty is shadowed
+              if (Object.prototype.hasOwnProperty.call(nextSource, nextKey)) {
+                to[nextKey] = nextSource[nextKey];
+              }
+            }
+          }
+        }
+        return to;
+      },
+      writable: true,
+      configurable: true
+    });
   }
 
 }
@@ -135,4 +186,4 @@ export const setLocale = locale => {
       console.warn(`Unsupported locale '${l}'. Falling back to default en.`);
     }
   }
-}
+}